Loans - Consumer, Excluding Credit Card Loan Portfolio, Loan Modifications, Nature and Extent of Modifications (Details) - Consumer, excluding credit card - loan	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Impaired [Line Items]
Percentage, sum of items by type, may exceed	100.00%
Total residential real estate – excluding PCI \| Trial Modification
Financing Receivable, Impaired [Line Items]
Number of loans modified	1,258	759
Total residential real estate – excluding PCI \| Permanent Modification
Financing Receivable, Impaired [Line Items]
Number of loans modified	1,550	2,767
Total residential real estate – excluding PCI \| Interest rate reduction
Financing Receivable, Impaired [Line Items]
Concession granted	78.00%	39.00%
Total residential real estate – excluding PCI \| Term or payment extension
Financing Receivable, Impaired [Line Items]
Concession granted	68.00%	43.00%
Total residential real estate – excluding PCI \| Principal and/or interest deferred
Financing Receivable, Impaired [Line Items]
Concession granted	12.00%	36.00%
Total residential real estate – excluding PCI \| Principal forgiveness
Financing Receivable, Impaired [Line Items]
Concession granted	6.00%	5.00%
Total residential real estate – excluding PCI \| Other
Financing Receivable, Impaired [Line Items]
Concession granted	60.00%	56.00%
Residential mortgage \| Trial Modification
Financing Receivable, Impaired [Line Items]
Number of loans modified	737	299
Residential mortgage \| Permanent Modification
Financing Receivable, Impaired [Line Items]
Number of loans modified	443	969
Residential mortgage \| Interest rate reduction
Financing Receivable, Impaired [Line Items]
Concession granted	61.00%	20.00%
Residential mortgage \| Term or payment extension
Financing Receivable, Impaired [Line Items]
Concession granted	88.00%	28.00%
Residential mortgage \| Principal and/or interest deferred
Financing Receivable, Impaired [Line Items]
Concession granted	27.00%	57.00%
Residential mortgage \| Principal forgiveness
Financing Receivable, Impaired [Line Items]
Concession granted	6.00%	6.00%
Residential mortgage \| Other
Financing Receivable, Impaired [Line Items]
Concession granted	36.00%	49.00%
Home equity \| Trial Modification
Financing Receivable, Impaired [Line Items]
Number of loans modified	521	460
Home equity \| Permanent Modification
Financing Receivable, Impaired [Line Items]
Number of loans modified	1,107	1,798
Home equity \| Interest rate reduction
Financing Receivable, Impaired [Line Items]
Concession granted	84.00%	49.00%
Home equity \| Term or payment extension
Financing Receivable, Impaired [Line Items]
Concession granted	61.00%	51.00%
Home equity \| Principal and/or interest deferred
Financing Receivable, Impaired [Line Items]
Concession granted	7.00%	25.00%
Home equity \| Principal forgiveness
Financing Receivable, Impaired [Line Items]
Concession granted	6.00%	5.00%
Home equity \| Other
Financing Receivable, Impaired [Line Items]
Concession granted	70.00%	60.00%

Financing Receivable, Modifications, Percentage of Modifications

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- Definition

In a group of items by type, the percentage that the sum of the items may exceed due to the inclusion of some items in more than one category. For example, in loan modifications, some loans may have more than one type of concession granted on the loan, so a sum of all types of loan modifications granted would exceed 100%.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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